Install-Piecemeal.ps1
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function Install-Piecemeal { <# .Synopsis Installs Piecemeal .Description Installs Piecemeal into a module. This enables extensibility within the module. .Notes This returns a modified Get-Extension .Example Install-Piecemeal -ExtensionModule RoughDraft -ExtensionModuleAlias rd -ExtensionTypeName RoughDraft.Extension .EXAMPLE Install-Piecemeal -ExtensionNoun 'PipeScript' -ExtensionPattern '\.psx\.ps(?<IsPowerShell>1{0,1})$','\.ps(?<IsPowerShell>1{0,1})\.(?<Extension>[^.]+$)','\.ps(?<IsPowerShell>1{0,1})$' -OutputPath '.\Get-PipeScript.ps1' -RenameVariable @{ExtensionPath='PipeScriptPath'} .Link Get-Extension #> [OutputType([string], [IO.FileInfo])] param( # The name of the module that is being extended. [Parameter(ValueFromPipelineByPropertyName)] [string] $ExtensionModule, # The verbs to install. By default, installs Get. [Parameter(ValueFromPipelineByPropertyName=$true)] [ValidateSet('Get','New')] [string[]] $Verb = @('Get'), # One or more aliases used to refer to the module being extended. [Parameter(ValueFromPipelineByPropertyName)] [string[]] $ExtensionModuleAlias, # If provided, will override the default extension name regular expression # (by default '(extension|ext|ex|x)\.ps1$' ) [Parameter(ValueFromPipelineByPropertyName)] [Alias('ExtensionNameRegEx', 'ExtensionPatterns')] [string[]] $ExtensionPattern = '(?<!-)(extension|ext|ex|x)\.ps1$', # The type name to add to an extension. This can be used to format the extension. [Parameter(ValueFromPipelineByPropertyName)] [string] $ExtensionTypeName, # The noun used for any extension commands. [Parameter(ValueFromPipelineByPropertyName)] [string] $ExtensionNoun, # If set, will require a [Management.Automation.Cmdlet] attribute to be considered an extension. # This attribute can associate the extension with one or more commands. [Parameter(ValueFromPipelineByPropertyName)] [switch] $RequireCmdletAttribute, # The output path. # If provided, contents will be written to the output path with Set-Content # Otherwise, contents will be returned. [Parameter(ValueFromPipelineByPropertyName)] [string] $OutputPath, # If provided, will rename variables. [Parameter(ValueFromPipelineByPropertyName)] [Collections.IDictionary] $RenameVariable = @{}, # A custom Foreach-Object that will be appended to main pipelines within Get-Extension. [ScriptBlock[]] $ForeachObject, # A custom Where-Object that will be injected to the main pipelines within Get-Extension [ScriptBlock[]] $WhereObject ) begin { $myModule = $MyInvocation.MyCommand.Module ${?<CurlyBrace>} = [Regex]::new('{(?<TrailingWhitespace>\s{0,})(?<Newline>[\r\n]{0,})?(?<Indent>\s{0,})?','Multiline') ${?<Indent>} = [Regex]::new('^\s{0,}', 'Multiline,RightToLeft') function FindRegion { param( [Parameter()] [string] $RegionName = $( '(?:.|\s)+?(?=\z|\s{0,}$)' # Matches anything until whitespace and the end of line. # This prevents trailing whitespace from failing to pair the match, but allows whitespace within the region name ) ) if ($PSBoundParameters['RegionName']) { $RegionName = $RegionName -replace '\s', '\s' } [Regex]::New(" [\n\r\s]{0,} # Preceeding whitespace \#region # The literal 'region' \s{1,} (?<Name>$RegionName) (?<Content> (?:.|\s)+?(?= \z| ^\s{0,}\#endregion\s\k<Name> ) ) ^\s{0,}\#endregion\s\k<Name> ", 'Multiline,IgnorePatternWhitespace,IgnoreCase') } } process { $myParams = [Ordered]@{} + $PSBoundParameters $myOutput = [Text.StringBuilder]::new() # Walk over each command this module exports. foreach ($exported in $myModule.ExportedCommands.Values) { # If the command is not a verb we're exporting, skip it. if ($exported.Verb -notin $Verb) { continue } # Copy the original text $commandString = $exported.ScriptBlock.Ast.ToString() # get the tokens (which have comments) $commandTokens = [Management.Automation.PSParser]::Tokenize($commandString, [ref]$null) # and get the parameters from the abstract syntax tree. $paramsAst = $exported.ScriptBlock.Ast.FindAll({param($ast) $ast -is [Management.Automation.Language.ParameterAst]}, $true) # Create a collection of default parameters and their values. # We will declare these as variables within the copy of the function. $defaultParameters = [Ordered]@{} $skipParameters = @( # Next, make a list of parameters we will skip foreach ($statement in $paramsAst) { # (any parameters declared by this function). if ($statement.Name.VariablePath.UserPath -and $MyInvocation.MyCommand.Parameters[$statement.Name.VariablePath.UserPath] ) { $statement } } ) # Now we start modifying the script $lengthChange = 0 # (keeping track of how much we change the length) #region Extract Skipped Parameters foreach ($skipParam in $skipParameters) { # Keep track of what we're skipping $toSkip = $skipParam.Extent if ($skipParam.DefaultValue) { # If it had a default value $defaultParameters["$($skipParam.Name)"] = "$($skipParam.DefaultValue)" # save it for later. } # Determine the figure out the length of the removal, according to the AST. $removeLength = $toSkip.EndOffset - $toSkip.StartOffset # If the parameter we're removing was immediately followed by a comma $immediatelyFollowedBy = $commandString[$toSkip.StartOffset + $removeLength - $lengthChange] if ($immediatelyFollowedBy -eq ',') { $removeLength += 1 # adjust the removed length } # Find all of the tokens that came before this point $beforeTokens = @($commandTokens | Where-Object Start -lt $toSkip.StartOffset) for ($i = -1; $i -gt -$beforeTokens.Length; $i--) { # we'll also want to remove any newlines or comments above the parameter if ($beforeTokens[$i].Type -notin 'Comment','Newline') { break } } # Adjust the pointer accordingly $realStart = $beforeTokens[$i - 1].Start + $beforeTokens[$i - 1].Length + 1 $removeLength += $toSkip.StartOffset - $realStart # Remove the content $changed = $commandString.Remove( $realStart - $lengthChange, $removeLength ) # Keep track of how much was removed $lengthChange += $removeLength # And update the command $commandString = $changed } #endregion Extract Skipped Parameters $insertIntoBlock = # We will insert parameters into the the first block that will run. foreach ($blockName in 'DynamicParam', 'Begin', 'Process', 'End') { if ($exported.ScriptBlock.Ast.Body."${blockName}Block") { $exported.ScriptBlock.Ast.Body."${blockName}Block"; break } } # Our pointer starts at the beginning of the block (minus what we've removed, plus the name of the block's length) $insertPoint = $insertIntoBlock.Extent.StartOffset - $lengthChange + "$($insertIntoBlock.BlockKind.Length)" # We find the next curly brace $foundCurly = ${?<CurlyBrace>}.Match($commandString, $insertPoint) $indentLevel = 0 if ($foundCurly.Success) { $insertPoint = $foundCurly.Index + $foundCurly.Length # then adjust our insertion point by this $indentLevel = ${?<Indent>}.Match($commandString, $insertPoint).Length # determine the indent $insertPoint -= $indentLevel # and then subtract it so we're inserting at the beginning of the line. } # Walk over each parameter passed in. foreach ($myParam in $myParams.GetEnumerator()) { $defaultParameters["`$$($myParam.Key)"] = # and assign them a default value. if ($null -ne ($myParam.Value -as [float])) { "$($myParam.Value)" } elseif ($myParam.Value -is [Array]) { "'$(@(foreach ($v in $myParam.Value) { "$v".Replace("'","''") }) -join "','")'" } else { "'$($myParam.Value.ToString().Replace("'","''"))'" } } $insertion = # Then, take all parameters that would be exported by the command @(foreach ($defaultParam in $defaultParameters.GetEnumerator()) { if (-not $exported.Parameters.($defaultParam.Key -replace '^\$')) { continue } # and put one declaration per line. "$(' ' * $indentLevel)$($defaultParam.Key) = $($defaultParam.Value)" }) -join [Environment]::NewLine # Add one more newline so that the original text is still indented. $insertion += [Environment]::NewLine $extensionCommandReplacement = if ($ExtensionNoun) { "`$1-$ExtensionNoun" } elseif ($ExtensionModule) { "`$1-$ExtensionModule`$2" } else { "`$1-Extension" } $extensionVariableReplacer = if ($ExtensionNoun) { "`$script:${ExtensionNoun}s" } elseif ($ExtensionModule) { "`$script:${ExtensionModule}Extensions" } else { "`$script:Extensions" } $otherDashReplacment = "-$( if ($ExtensionNoun) { "$ExtensionNoun" } elseif ($ExtensionModule) { "${ExtensionModule}Extension" } else { "Extension" })" $newCommand = $commandString.Insert($insertPoint, $insertion) -replace # Finally, we insert the default values "($($exported.Verb))-($($exported.Noun))", $extensionCommandReplacement -replace # change the name '\$script:Extensions', $extensionVariableReplacer -replace # change the inner variable references, " Extensions ", " $(if ($ExtensionNoun) { $ExtensionNoun } else { $ExtensionModule + 'Extensions'}) " -replace # and update likely documentation mentions "-Extension", $otherDashReplacment $null = $myOutput.AppendLine($newCommand) if ($ExtensionNoun) { foreach ($paramName in $exported.Parameters.Keys) { if ($paramName -match 'Extension') { $RenameVariable[$paramName] = $paramName -replace 'Extension', $ExtensionNoun } } } } $myOutput = if (-not $NoLogo) { $installInstructions = @( "Install-Module $($myModule.Name) -Scope CurrentUser" "$([Environment]::NewLine)# Import-Module $($myModule.Name) -Force" "$([Environment]::NewLine)# $($MyInvocation.MyCommand.Name)" $(if ($myParams.Verb) {"-Verb $($verb -join ',')"}) @(foreach ($kv in $myParams.GetEnumerator()) { if ($kv.Value -is [switch] -and $kv.Value) { "-$($kv.Key)" } elseif ($kv.Value -is [string]) { "-$($kv.Key) '$($kv.Value)'" } elseif ($kv.Value -is [string[]]) { "-$($kv.Key) '$($kv.Value -join "','")'" } elseif ($kv.Value -is [Collections.IDictionary]) { "-$($kv.Key) @{$( @( foreach ($ikv in $kv.Value.GetEnumerator()) { '' + $ikv.Key + '=' + "'" + "$($ikv.Value)".Replace("'","''") + "'" } ) -join ';' )}" } }) | Sort-Object ) -join ' ' $logo = @( $myModule.Name '[' $myModule.Version ']' ':' $myModule.Description ) -join ' ' $null = $myOutput.Insert(0, ("#region $logo" + [Environment]::NewLine + "# $installInstructions" + [Environment]::NewLine)) $null = $myOutput.AppendLine("#endregion $logo") "$myOutput" } else { "$myOutput" } if ($ForeachObject) { $regionFinder = FindRegion -RegionName "Install-Piecemeal -ForeachObject" $myOutput = $regionFinder.Replace($myOutput, { '|' + [Environment]::NewLine + @(foreach ($foreachStatement in $ForeachObject) { if ($foreachStatement.Ast.ProcessBlock -or $foreachStatement.Ast.BeginBlock) { ". {$ForeachStatement}" } elseif ($foreachStatement.Ast.EndBlock.Statements -and $foreachStatement.Ast.EndBlock.Statements[0].PipelineElements[0].CommandElements -and $foreachStatement.Ast.EndBlock.Statements[0].PipelineElements[0].CommandElements.Value -in 'Foreach-Object', '%') { "$ForeachStatement" } else { "Foreach-Object {$ForeachStatement}" } }) -join (' |' + [Environment]::NewLine) }) } if ($WhereObject) { $regionFinder = FindRegion -RegionName "Install-Piecemeal -WhereObject" $myOutput = $regionFinder.Replace($myOutput, { $( @(foreach ($whereStatement in $WhereObject) { if ($whereStatement.Ast.ProcessBlock -or $whereStatement.Ast.BeginBlock) { "& {$whereStatement}" } elseif ($whereStatement.Ast.EndBlock.Statements -and $whereStatement.Ast.EndBlock.Statements[0].PipelineElements[0].CommandElements -and $whereStatement.Ast.EndBlock.Statements[0].PipelineElements[0].CommandElements.Value -in 'Where-Object', '?') { "$whereStatement" } else { "Where-Object {$whereStatement}" } }) -join (' |' + [Environment]::NewLine) ' |' ) }) } $newScriptBlock = [ScriptBlock]::Create($myOutput) $newScriptBlockText = "$newScriptBlock" if ($newScriptBlock -and $RenameVariable.Count) { $TextReplacement = [Ordered]@{} $variablesToRename = @($newScriptBlock.Ast.FindAll({ param($ast) if ($ast -isnot [Management.Automation.Language.VariableExpressionast]) { return $false } if ($RenameVariable.Contains("$($ast.VariablePath)")) { return $true} return $false }, $true)) $myOffset = 0 foreach ($var in $variablesToRename) { $renameToValue = $RenameVariable["$($var.VariablePath)"] $start = $newScriptBlockText.IndexOf($var.Extent.Text, $myOffset) $end = $start + $var.Extent.Text.Length $TextReplacement["$start,$end"] = if ($var.Splatted) { '@' + ($renameToValue -replace '^[\$\@]') } else { '$' + ($renameToValue -replace '^[\$\@]') } $myOffset = $end } $newText = @( $index = 0 foreach ($tr in $TextReplacement.GetEnumerator()) { $start, $end = $tr.Key -split ',' -as [int[]] if (-not $start -and -not $end ) { continue } if ($start -gt $index) { $newScriptBlockText.Substring($index, $start - $index) } $tr.Value $index = $end } if ($index -lt $newScriptBlockText.Length) { $newScriptBlockText.Substring($index) } ) $newScriptBlock = [scriptblock]::Create($newText -join '') } if ($OutputPath) { "$newScriptBlock" | Set-Content -Path $OutputPath Get-Item -Path $OutputPath } else { $newScriptBlock } } } |